Drilling tool



FIG. 1 is a perspective view of a drilling tool showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a plan view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is an enlarged left side view thereof;

FIG. 7 is an enlarged perspective view thereof;

FIG. 8 is an enlarged front view thereof;

FIG. 9 is an enlarged plan view thereof;

FIG. 10 is an enlarged left view thereof; and,

FIG. 11 is a reduced perspective view thereof.

The broken lines shown in the drawings represent portions of the drilling tool that form no part of the claimed design. 

CLAIM The ornamental design for a drilling tool, as shown and described. 